package com.atguigu.gulimall.cart.interceptor;

import com.atguigu.common.constant.CartConstant;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.cart.vo.UserInfoTo;
import org.apache.commons.lang.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * 拦截器要在mywebconfig中添加
 */
@Component
public class CartIntercepter implements HandlerInterceptor {

    public static ThreadLocal<UserInfoTo> threadLocal=new ThreadLocal<>();

    /**
     * 用于共享用户id和临时用户key
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo=new UserInfoTo();
        HttpSession session=request.getSession();
        MemberRespVo user=(MemberRespVo)session.getAttribute("loginUser");
        if(user!=null){
            userInfoTo.setUserId(user.getId());
        }
        Cookie[] cookies=request.getCookies();
        if(cookies!=null) {
            for (Cookie cookie : cookies) {
                if (cookie.getName().equals(CartConstant.TEMP_USER_COOKIE_NAME)) {
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                }
            }
        }
        if(StringUtils.isEmpty(userInfoTo.getUserKey())){
            String uuid= UUID.randomUUID().toString().replace("-","");
            userInfoTo.setUserKey(uuid);
        }
        threadLocal.set(userInfoTo);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = CartIntercepter.threadLocal.get();
        if(userInfoTo.getTempUser()){
            return;
        }
        Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
        cookie.setDomain("gulimall.com");
        cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
        response.addCookie(cookie);
    }
}
